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Equity - Share activity (Details) - shares shares in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Increase (decrease) in common stock, number of shares
Balance at beginning of period (in shares)	66,818	66,526	71,996
Stock options exercised	124	182	209
Purchase/acquisition of treasury stock (in shares)	0
Purchase/acquisition of treasury stock (in shares)			(5,847)
Balance at end of period (in shares)	67,016	66,818	66,526
Restricted stock units (RSUs) | Employee
Increase (decrease) in common stock, number of shares
Issuance of share-based awards (in shares)	69	105	100
Performance shares and other share-based awards
Increase (decrease) in common stock, number of shares
Issuance of share-based awards (in shares)	5	5	68
Common Stock
Increase (decrease) in common stock, number of shares
Balance at beginning of period (in shares)	77,811	77,811	77,811
Balance at end of period (in shares)	77,811	77,811	77,811
Treasury Stock
Increase (decrease) in common stock, number of shares
Balance at beginning of period (in shares)	10,993	11,285	5,815
Stock options exercised	(124)	(182)	(209)
Purchase/acquisition of treasury stock (in shares)			5,847
Balance at end of period (in shares)	10,795	10,993	11,285
Treasury Stock | Restricted stock units (RSUs) | Employee
Increase (decrease) in common stock, number of shares
Issuance of share-based awards (in shares)	(69)	(105)	(100)
Treasury Stock | Performance shares and other share-based awards
Increase (decrease) in common stock, number of shares
Issuance of share-based awards (in shares)	(5)	(5)	(68)

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Number of shares issued during the period related to Restricted Stock Awards, net of any shares forfeited.

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